Blowing-out nozzle for conveying plants operated with compressed air



Oct. 29, 1929. H. HORN 17,733,302

BLOWING-OUT NOZZLE FOR CONVEYING PLANTS OPERATED WITH COMPRESSED AIR Filed Aug. 8, 1927 2 Sheets-Sheet 1 June for:

Oct. 29, 1929. H. HORN 1,733,302

BLOWING-OUT NOZZLE FOR CONVEYING PLANTS OPERATED WITH COMPRESSED AIR Filed Au 8, 1927 2 Sheets-Sheet 2 Patented Oct. 29, 1929 UNITED STATES PATENT OFFICE HANS HORN, F DESSAU, GERMANY, ASSIGNOE TO G. POLYSIUS, OF DESSAU, GER- MANY, A PARTNERSHIP BLOWING-OUT NOZZLE FOR CONVEYING PLANTS OPERATED WITH COMPRESSED AIR Application filed August 8, 1927, Serial No. 211,542, and in Germany October 8, 1926.

It is known from experience that the pipings used for conveying big amounts of pulverulent materials by means of Compressed air must be cleaned by being blown out also by means or" compressed air which is introduced into the conveying pipes at a plurality of points. That is efiected with the aid of nozzles inserted into the walls of the respective pipes. There are known nozzles, or blowing-out nozzles respectively, in which a plurality of slots or similar or other orifices is provided through which the compressed air rushes into the pipes, as well as a shuttingoff member or valve for regulating the amount of the compressed air permitted to pass through said slots or the like. Nozzles of that kind entail the drawback that their blowing-out orifices are easily clogged by the pulverulent material during its conveyance through the piping. This is particularly disadvantageous if the respective material becomes hard when coming into intimate contact with air. It is even with compressed air of the highest pressure admissible for the conveyance, viz 6 atm., nearly or, in some cases, entirely impossible to blow the hardened material out of the clogged orifices. Endeavors to overcome this drawback have been made, but not met with success.

Now, the present invention presents a solution of the problem. It has been discovered that, firstly, individual orifices, such as slots or the like, must and can be completely dispensed with, and that, secondly, means must and can be provided for completely closing the free sectional area of the nozzle,in such a manner, that there remains no slot or hole or cavity whatever in which any amount of the respective pulverulent material can collect and be retained. In otherwords The pulverulent material moves along continuous walls while it is conveyed by the compressed air, and only when, after the conveyance, the piping is to be cleaned by being blown out, certain portions of the walls are so moved as to form stitute a kind of nozzle, the movable members of which may be actuated either mechanically, or positively respectively, or automatically, in which latter case they are made elastic so that they can yield when the blowingout air is admitted and presses upon them in inward direction. The nozzle consists generally of a plurality of circularly curved parts, the radius of curvature of which is exactly the same as that of the conveying pipe, so that the assembled nozzle portions constitute, in their position of rest, a certain short piece of said pipe. The nozzle portions are enclosed in a casing connected with a comppessed-air supply, all as fully described herealter.

The invention, is illustrated diagrammatically and by way of example on the accompanying drawings, on which Fig. 1 is an axial section through a portion of a conveying pipe provided with a blowing-out nozzle designed according to this invention, Fig. 2 is a transverse section through said pipe and said nozzle, i. e. just where a certain short portion of the conveying pipe is formed by portions of the nozzle (which is shown closed in this figure), and Fig. 3 shows the nozzle open so that the blowing-out air can flow into it and into the conveying pipe proper through the gaps between the nozzle portions. Fig. 4 is a transverse section through a modification, the nozzle-forming members being shown in that position in which the nozzle is closed (as in Fig. 2), and the plane of section being 44 of Fig. 5; Fig. 5 is an axial section through the nozzle in the plane 55 of Fig. 4, and Fig. 6 is a view like Fig. 4., but showing the nozzle open (as in Fig.

On the drawing, a, Fig. 1, denotes that portion of the piping which is combined with the nozzles; b and c are the neighbouring parts of the piping. The nozzle is formed in this example by four circularly curved members d, f, g and h which are shown in Fig. 2 in that position in which they constitute a portion of the path for the pulverulent material to be conveyed through the piping by compressed air. The tree sectional area of the closed nozzle (Fig. 2) is exactly the same as that of the other parts of the piping, and there are no slots or holes or cavities whatever in which even only quite small amounts of that material could collect and be retained. This fact is quite obvious from Fig. 2.

The curved members (i, f, g, h are firmly connected with arms or levers 2', 1 6, Z, m carried by pins 0, p, 9", 8 supported in the walls of a casing w enclosing all these parts, and the outer ends of said arms or levers are connected by bolts with a ring at engaged at its lowermost portion by an eccentric pivot tconnected with a plug 4) which can be turned in the one or the other direction by a grip 1 whereby the ring at will be correspondingly turned, in consequence whereof the arms or levers 2', is, Z, m will be turned on the pins 0, p, r, s and the curved nozzle members will either be opened (Fig. 3) or closed (Fig. 2), according to the direction of movement of the grip y. The plug 0 is supported in the walls of an additional casing to which communicates with the compressed-air pipe 2. it is obvious that the compressed air which fills the casing w will rush into the piping instantly when the nozzle d, f, g, h is opened in the manner as described.

The bore 4) of the plug 4) establishes a communication between the pipe 2 and the casing w when the nozzle members are moved from the position, Fig. 2 into the position Fig. 3 so that now the compressed air can pass to the nozzle members and flow through the gaps established between them (Fig, 3), Prior thereto, when there are no gaps (Fig. 2), the position of the bore of the plug is such that the cock formed by it and the wall of the additional casing 10" is closed, so that during this time the nozzle members are not subjected to the pressure of the compressed In the modification shown in Figs. 4, 5 and 6, the parts 5, 0 of the conveying pipe are connected with each other by the nozzle body a. The nozzle-members proper d, f, g, 71 are elastic, and each is firmly secured to the body a, at its angularly bent end 71, 74', Z, m by means of bolts 00'. When the elastic nozzle-members cl, 6', f, g are not exposed to the pressure of the compressed air, that is r to say, when the plug 0 is closed, the nozzle members are in the position shown in Fig. 4, which shows that position in which the pulverulent material is to beconveyed through.

the piping. Thereafter the compressed air is changed over from the conveying pipe to V the chamber a of the nozzle-casing a whereupon the compressed' air will depress the elastic nozzle members and force its way into theconveying tube through the gaps between the nozzle-members, as inFig. 6.

I claim: I

.1. A'blowing-ont nozzle for conveyingplants operated by compressed air, said nozzle comprising in combination, a plurality of seginent'ally shaped nozzle-members having a radius of curvature corresponding to that of the conveying pipe into which the nozzle is inserted, said nozzle members being each mounted swingably at one end, a casing enclosing said nozzle-members, means to swing said nozzle-members so as to open said nozzle towards said casing or so as to close said nozzle to form a part of the passage of said conveying pipe.

2. A blowing-out nozzle as specifiedby claim 1, wherein the means to swing the nozzle-members consist of a rotatably mounted. ring adapted to swing said nozzle-members.

3. A blowing-out nozzle as specified by claim 1, wherein the means to swing the nozzle-members consist of a rotatably-mounted ring adapted to swing said nozzle members, and levers intermediate said ring and said nozzle-members. V 4-. A blowing-out nozzle as specified by claim 1, wherein the means toswing the nozzle-members consist of a rotatably mounted ring adapted to swing said nozzle-members, levers intermediate said ring and said nozzle-members, and an eccentric adapted to operate said ring to open and close said nozzlemembers. v

5. A blowing-out nozzle for conveying plants operated by compressed air, comprising in combination, a plurality ofcircularly curved nozzle-members, the radius of curvature of which corresponds to that of the conveying pipe into which the nozzle isinserted, said nozzle-membersbeing-.movably mounted and so arranged with respect to one another as to constitute, when closed, a partof the conveying passage, a casingenclosing said nozzle-members and adapted to communicatewith the space within said nozzle-members, when open, and means for supporting said nozzle-members in said casing.

6. A blowing-out nozzle as specified by claim 1, having aplug for the pressure-air, said plug being united with the casing which encloses the nozzle-members. y

In testimony whereof I 'aifix my signature. 

